It shall be lawful for the Governor-General, whenever he shall deem it advisable, to issue a Commission, appointing one or more Commissioners, and authorising such Commissioners, or any quorum of them therein mentioned, to enquire into the conduct or management of any department of the public service, or of any public or local institution, or the conduct of any public or local officers of this Island, or of any parish, or district thereof, or into any matter in which an enquiry would in the opinion of the Governor-General, be for the public welfare.